import { deepNormalizeScriptCov, normalizeFunctionCov, normalizeProcessCov, normalizeRangeTree, normalizeScriptCov, } from "./normalize";
import { RangeTree } from "./range-tree";
/**
 * Merges a list of process coverages.
 *
 * The result is normalized.
 * The input values may be mutated, it is not safe to use them after passing
 * them to this function.
 * The computation is synchronous.
 *
 * @param processCovs Process coverages to merge.
 * @return Merged process coverage.
 */
export function mergeProcessCovs(processCovs) {
    if (processCovs.length === 0) {
        return { result: [] };
    }
    const urlToScripts = new Map();
    for (const processCov of processCovs) {
        for (const scriptCov of processCov.result) {
            let scriptCovs = urlToScripts.get(scriptCov.url);
            if (scriptCovs === undefined) {
                scriptCovs = [];
                urlToScripts.set(scriptCov.url, scriptCovs);
            }
            scriptCovs.push(scriptCov);
        }
    }
    const result = [];
    for (const scripts of urlToScripts.values()) {
        // assert: `scripts.length > 0`
        result.push(mergeScriptCovs(scripts));
    }
    const merged = { result };
    normalizeProcessCov(merged);
    return merged;
}
/**
 * Merges a list of matching script coverages.
 *
 * Scripts are matching if they have the same `url`.
 * The result is normalized.
 * The input values may be mutated, it is not safe to use them after passing
 * them to this function.
 * The computation is synchronous.
 *
 * @param scriptCovs Process coverages to merge.
 * @return Merged script coverage, or `undefined` if the input list was empty.
 */
export function mergeScriptCovs(scriptCovs) {
    if (scriptCovs.length === 0) {
        return undefined;
    }
    else if (scriptCovs.length === 1) {
        const merged = scriptCovs[0];
        deepNormalizeScriptCov(merged);
        return merged;
    }
    const first = scriptCovs[0];
    const scriptId = first.scriptId;
    const url = first.url;
    const rangeToFuncs = new Map();
    for (const scriptCov of scriptCovs) {
        for (const funcCov of scriptCov.functions) {
            const rootRange = stringifyFunctionRootRange(funcCov);
            let funcCovs = rangeToFuncs.get(rootRange);
            if (funcCovs === undefined ||
                // if the entry in rangeToFuncs is function-level granularity and
                // the new coverage is block-level, prefer block-level.
                (!funcCovs[0].isBlockCoverage && funcCov.isBlockCoverage)) {
                funcCovs = [];
                rangeToFuncs.set(rootRange, funcCovs);
            }
            else if (funcCovs[0].isBlockCoverage && !funcCov.isBlockCoverage) {
                // if the entry in rangeToFuncs is block-level granularity, we should
                // not append function level granularity.
                continue;
            }
            funcCovs.push(funcCov);
        }
    }
    const functions = [];
    for (const funcCovs of rangeToFuncs.values()) {
        // assert: `funcCovs.length > 0`
        functions.push(mergeFunctionCovs(funcCovs));
    }
    const merged = { scriptId, url, functions };
    normalizeScriptCov(merged);
    return merged;
}
/**
 * Returns a string representation of the root range of the function.
 *
 * This string can be used to match function with same root range.
 * The string is derived from the start and end offsets of the root range of
 * the function.
 * This assumes that `ranges` is non-empty (true for valid function coverages).
 *
 * @param funcCov Function coverage with the range to stringify
 * @internal
 */
function stringifyFunctionRootRange(funcCov) {
    const rootRange = funcCov.ranges[0];
    return `${rootRange.startOffset.toString(10)};${rootRange.endOffset.toString(10)}`;
}
/**
 * Merges a list of matching function coverages.
 *
 * Functions are matching if their root ranges have the same span.
 * The result is normalized.
 * The input values may be mutated, it is not safe to use them after passing
 * them to this function.
 * The computation is synchronous.
 *
 * @param funcCovs Function coverages to merge.
 * @return Merged function coverage, or `undefined` if the input list was empty.
 */
export function mergeFunctionCovs(funcCovs) {
    if (funcCovs.length === 0) {
        return undefined;
    }
    else if (funcCovs.length === 1) {
        const merged = funcCovs[0];
        normalizeFunctionCov(merged);
        return merged;
    }
    const functionName = funcCovs[0].functionName;
    const trees = [];
    for (const funcCov of funcCovs) {
        // assert: `fn.ranges.length > 0`
        // assert: `fn.ranges` is sorted
        trees.push(RangeTree.fromSortedRanges(funcCov.ranges));
    }
    // assert: `trees.length > 0`
    const mergedTree = mergeRangeTrees(trees);
    normalizeRangeTree(mergedTree);
    const ranges = mergedTree.toRanges();
    const isBlockCoverage = !(ranges.length === 1 && ranges[0].count === 0);
    const merged = { functionName, ranges, isBlockCoverage };
    // assert: `merged` is normalized
    return merged;
}
/**
 * @precondition Same `start` and `end` for all the trees
 */
function mergeRangeTrees(trees) {
    if (trees.length <= 1) {
        return trees[0];
    }
    const first = trees[0];
    let delta = 0;
    for (const tree of trees) {
        delta += tree.delta;
    }
    const children = mergeRangeTreeChildren(trees);
    return new RangeTree(first.start, first.end, delta, children);
}
class RangeTreeWithParent {
    constructor(parentIndex, tree) {
        this.parentIndex = parentIndex;
        this.tree = tree;
    }
}
class StartEvent {
    constructor(offset, trees) {
        this.offset = offset;
        this.trees = trees;
    }
    static compare(a, b) {
        return a.offset - b.offset;
    }
}
class StartEventQueue {
    constructor(queue) {
        this.queue = queue;
        this.nextIndex = 0;
        this.pendingOffset = 0;
        this.pendingTrees = undefined;
    }
    static fromParentTrees(parentTrees) {
        const startToTrees = new Map();
        for (const [parentIndex, parentTree] of parentTrees.entries()) {
            for (const child of parentTree.children) {
                let trees = startToTrees.get(child.start);
                if (trees === undefined) {
                    trees = [];
                    startToTrees.set(child.start, trees);
                }
                trees.push(new RangeTreeWithParent(parentIndex, child));
            }
        }
        const queue = [];
        for (const [startOffset, trees] of startToTrees) {
            queue.push(new StartEvent(startOffset, trees));
        }
        queue.sort(StartEvent.compare);
        return new StartEventQueue(queue);
    }
    setPendingOffset(offset) {
        this.pendingOffset = offset;
    }
    pushPendingTree(tree) {
        if (this.pendingTrees === undefined) {
            this.pendingTrees = [];
        }
        this.pendingTrees.push(tree);
    }
    next() {
        const pendingTrees = this.pendingTrees;
        const nextEvent = this.queue[this.nextIndex];
        if (pendingTrees === undefined) {
            this.nextIndex++;
            return nextEvent;
        }
        else if (nextEvent === undefined) {
            this.pendingTrees = undefined;
            return new StartEvent(this.pendingOffset, pendingTrees);
        }
        else {
            if (this.pendingOffset < nextEvent.offset) {
                this.pendingTrees = undefined;
                return new StartEvent(this.pendingOffset, pendingTrees);
            }
            else {
                if (this.pendingOffset === nextEvent.offset) {
                    this.pendingTrees = undefined;
                    for (const tree of pendingTrees) {
                        nextEvent.trees.push(tree);
                    }
                }
                this.nextIndex++;
                return nextEvent;
            }
        }
    }
}
function mergeRangeTreeChildren(parentTrees) {
    const result = [];
    const startEventQueue = StartEventQueue.fromParentTrees(parentTrees);
    const parentToNested = new Map();
    let openRange;
    while (true) {
        const event = startEventQueue.next();
        if (event === undefined) {
            break;
        }
        if (openRange !== undefined && openRange.end <= event.offset) {
            result.push(nextChild(openRange, parentToNested));
            openRange = undefined;
        }
        if (openRange === undefined) {
            let openRangeEnd = event.offset + 1;
            for (const { parentIndex, tree } of event.trees) {
                openRangeEnd = Math.max(openRangeEnd, tree.end);
                insertChild(parentToNested, parentIndex, tree);
            }
            startEventQueue.setPendingOffset(openRangeEnd);
            openRange = { start: event.offset, end: openRangeEnd };
        }
        else {
            for (const { parentIndex, tree } of event.trees) {
                if (tree.end > openRange.end) {
                    const right = tree.split(openRange.end);
                    startEventQueue.pushPendingTree(new RangeTreeWithParent(parentIndex, right));
                }
                insertChild(parentToNested, parentIndex, tree);
            }
        }
    }
    if (openRange !== undefined) {
        result.push(nextChild(openRange, parentToNested));
    }
    return result;
}
function insertChild(parentToNested, parentIndex, tree) {
    let nested = parentToNested.get(parentIndex);
    if (nested === undefined) {
        nested = [];
        parentToNested.set(parentIndex, nested);
    }
    nested.push(tree);
}
function nextChild(openRange, parentToNested) {
    const matchingTrees = [];
    for (const nested of parentToNested.values()) {
        if (nested.length === 1 && nested[0].start === openRange.start && nested[0].end === openRange.end) {
            matchingTrees.push(nested[0]);
        }
        else {
            matchingTrees.push(new RangeTree(openRange.start, openRange.end, 0, nested));
        }
    }
    parentToNested.clear();
    return mergeRangeTrees(matchingTrees);
}

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{\n  deepNormalizeScriptCov,\n  normalizeFunctionCov,\n  normalizeProcessCov,\n  normalizeRangeTree,\n  normalizeScriptCov,\n} from \"./normalize\";\nimport { RangeTree } from \"./range-tree\";\nimport { FunctionCov, ProcessCov, Range, RangeCov, ScriptCov } from \"./types\";\n\n/**\n * Merges a list of process coverages.\n *\n * The result is normalized.\n * The input values may be mutated, it is not safe to use them after passing\n * them to this function.\n * The computation is synchronous.\n *\n * @param processCovs Process coverages to merge.\n * @return Merged process coverage.\n */\nexport function mergeProcessCovs(processCovs: ReadonlyArray<ProcessCov>): ProcessCov {\n  if (processCovs.length === 0) {\n    return {result: []};\n  }\n\n  const urlToScripts: Map<string, ScriptCov[]> = new Map();\n  for (const processCov of processCovs) {\n    for (const scriptCov of processCov.result) {\n      let scriptCovs: ScriptCov[] | undefined = urlToScripts.get(scriptCov.url);\n      if (scriptCovs === undefined) {\n        scriptCovs = [];\n        urlToScripts.set(scriptCov.url, scriptCovs);\n      }\n      scriptCovs.push(scriptCov);\n    }\n  }\n\n  const result: ScriptCov[] = [];\n  for (const scripts of urlToScripts.values()) {\n    // assert: `scripts.length > 0`\n    result.push(mergeScriptCovs(scripts)!);\n  }\n  const merged: ProcessCov = {result};\n\n  normalizeProcessCov(merged);\n  return merged;\n}\n\n/**\n * Merges a list of matching script coverages.\n *\n * Scripts are matching if they have the same `url`.\n * The result is normalized.\n * The input values may be mutated, it is not safe to use them after passing\n * them to this function.\n * The computation is synchronous.\n *\n * @param scriptCovs Process coverages to merge.\n * @return Merged script coverage, or `undefined` if the input list was empty.\n */\nexport function mergeScriptCovs(scriptCovs: ReadonlyArray<ScriptCov>): ScriptCov | undefined {\n  if (scriptCovs.length === 0) {\n    return undefined;\n  } else if (scriptCovs.length === 1) {\n    const merged: ScriptCov = scriptCovs[0];\n    deepNormalizeScriptCov(merged);\n    return merged;\n  }\n\n  const first: ScriptCov = scriptCovs[0];\n  const scriptId: string = first.scriptId;\n  const url: string = first.url;\n\n  const rangeToFuncs: Map<string, FunctionCov[]> = new Map();\n  for (const scriptCov of scriptCovs) {\n    for (const funcCov of scriptCov.functions) {\n      const rootRange: string = stringifyFunctionRootRange(funcCov);\n      let funcCovs: FunctionCov[] | undefined = rangeToFuncs.get(rootRange);\n\n      if (funcCovs === undefined ||\n        // if the entry in rangeToFuncs is function-level granularity and\n        // the new coverage is block-level, prefer block-level.\n        (!funcCovs[0].isBlockCoverage && funcCov.isBlockCoverage)) {\n        funcCovs = [];\n        rangeToFuncs.set(rootRange, funcCovs);\n      } else if (funcCovs[0].isBlockCoverage && !funcCov.isBlockCoverage) {\n        // if the entry in rangeToFuncs is block-level granularity, we should\n        // not append function level granularity.\n        continue;\n      }\n      funcCovs.push(funcCov);\n    }\n  }\n\n  const functions: FunctionCov[] = [];\n  for (const funcCovs of rangeToFuncs.values()) {\n    // assert: `funcCovs.length > 0`\n    functions.push(mergeFunctionCovs(funcCovs)!);\n  }\n\n  const merged: ScriptCov = {scriptId, url, functions};\n  normalizeScriptCov(merged);\n  return merged;\n}\n\n/**\n * Returns a string representation of the root range of the function.\n *\n * This string can be used to match function with same root range.\n * The string is derived from the start and end offsets of the root range of\n * the function.\n * This assumes that `ranges` is non-empty (true for valid function coverages).\n *\n * @param funcCov Function coverage with the range to stringify\n * @internal\n */\nfunction stringifyFunctionRootRange(funcCov: Readonly<FunctionCov>): string {\n  const rootRange: RangeCov = funcCov.ranges[0];\n  return `${rootRange.startOffset.toString(10)};${rootRange.endOffset.toString(10)}`;\n}\n\n/**\n * Merges a list of matching function coverages.\n *\n * Functions are matching if their root ranges have the same span.\n * The result is normalized.\n * The input values may be mutated, it is not safe to use them after passing\n * them to this function.\n * The computation is synchronous.\n *\n * @param funcCovs Function coverages to merge.\n * @return Merged function coverage, or `undefined` if the input list was empty.\n */\nexport function mergeFunctionCovs(funcCovs: ReadonlyArray<FunctionCov>): FunctionCov | undefined {\n  if (funcCovs.length === 0) {\n    return undefined;\n  } else if (funcCovs.length === 1) {\n    const merged: FunctionCov = funcCovs[0];\n    normalizeFunctionCov(merged);\n    return merged;\n  }\n\n  const functionName: string = funcCovs[0].functionName;\n\n  const trees: RangeTree[] = [];\n  for (const funcCov of funcCovs) {\n    // assert: `fn.ranges.length > 0`\n    // assert: `fn.ranges` is sorted\n    trees.push(RangeTree.fromSortedRanges(funcCov.ranges)!);\n  }\n\n  // assert: `trees.length > 0`\n  const mergedTree: RangeTree = mergeRangeTrees(trees)!;\n  normalizeRangeTree(mergedTree);\n  const ranges: RangeCov[] = mergedTree.toRanges();\n  const isBlockCoverage: boolean = !(ranges.length === 1 && ranges[0].count === 0);\n\n  const merged: FunctionCov = {functionName, ranges, isBlockCoverage};\n  // assert: `merged` is normalized\n  return merged;\n}\n\n/**\n * @precondition Same `start` and `end` for all the trees\n */\nfunction mergeRangeTrees(trees: ReadonlyArray<RangeTree>): RangeTree | undefined {\n  if (trees.length <= 1) {\n    return trees[0];\n  }\n  const first: RangeTree = trees[0];\n  let delta: number = 0;\n  for (const tree of trees) {\n    delta += tree.delta;\n  }\n  const children: RangeTree[] = mergeRangeTreeChildren(trees);\n  return new RangeTree(first.start, first.end, delta, children);\n}\n\nclass RangeTreeWithParent {\n  readonly parentIndex: number;\n  readonly tree: RangeTree;\n\n  constructor(parentIndex: number, tree: RangeTree) {\n    this.parentIndex = parentIndex;\n    this.tree = tree;\n  }\n}\n\nclass StartEvent {\n  readonly offset: number;\n  readonly trees: RangeTreeWithParent[];\n\n  constructor(offset: number, trees: RangeTreeWithParent[]) {\n    this.offset = offset;\n    this.trees = trees;\n  }\n\n  static compare(a: StartEvent, b: StartEvent): number {\n    return a.offset - b.offset;\n  }\n}\n\nclass StartEventQueue {\n  private readonly queue: StartEvent[];\n  private nextIndex: number;\n  private pendingOffset: number;\n  private pendingTrees: RangeTreeWithParent[] | undefined;\n\n  private constructor(queue: StartEvent[]) {\n    this.queue = queue;\n    this.nextIndex = 0;\n    this.pendingOffset = 0;\n    this.pendingTrees = undefined;\n  }\n\n  static fromParentTrees(parentTrees: ReadonlyArray<RangeTree>): StartEventQueue {\n    const startToTrees: Map<number, RangeTreeWithParent[]> = new Map();\n    for (const [parentIndex, parentTree] of parentTrees.entries()) {\n      for (const child of parentTree.children) {\n        let trees: RangeTreeWithParent[] | undefined = startToTrees.get(child.start);\n        if (trees === undefined) {\n          trees = [];\n          startToTrees.set(child.start, trees);\n        }\n        trees.push(new RangeTreeWithParent(parentIndex, child));\n      }\n    }\n    const queue: StartEvent[] = [];\n    for (const [startOffset, trees] of startToTrees) {\n      queue.push(new StartEvent(startOffset, trees));\n    }\n    queue.sort(StartEvent.compare);\n    return new StartEventQueue(queue);\n  }\n\n  setPendingOffset(offset: number): void {\n    this.pendingOffset = offset;\n  }\n\n  pushPendingTree(tree: RangeTreeWithParent): void {\n    if (this.pendingTrees === undefined) {\n      this.pendingTrees = [];\n    }\n    this.pendingTrees.push(tree);\n  }\n\n  next(): StartEvent | undefined {\n    const pendingTrees: RangeTreeWithParent[] | undefined = this.pendingTrees;\n    const nextEvent: StartEvent | undefined = this.queue[this.nextIndex];\n    if (pendingTrees === undefined) {\n      this.nextIndex++;\n      return nextEvent;\n    } else if (nextEvent === undefined) {\n      this.pendingTrees = undefined;\n      return new StartEvent(this.pendingOffset, pendingTrees);\n    } else {\n      if (this.pendingOffset < nextEvent.offset) {\n        this.pendingTrees = undefined;\n        return new StartEvent(this.pendingOffset, pendingTrees);\n      } else {\n        if (this.pendingOffset === nextEvent.offset) {\n          this.pendingTrees = undefined;\n          for (const tree of pendingTrees) {\n            nextEvent.trees.push(tree);\n          }\n        }\n        this.nextIndex++;\n        return nextEvent;\n      }\n    }\n  }\n}\n\nfunction mergeRangeTreeChildren(parentTrees: ReadonlyArray<RangeTree>): RangeTree[] {\n  const result: RangeTree[] = [];\n  const startEventQueue: StartEventQueue = StartEventQueue.fromParentTrees(parentTrees);\n  const parentToNested: Map<number, RangeTree[]> = new Map();\n  let openRange: Range | undefined;\n\n  while (true) {\n    const event: StartEvent | undefined = startEventQueue.next();\n    if (event === undefined) {\n      break;\n    }\n\n    if (openRange !== undefined && openRange.end <= event.offset) {\n      result.push(nextChild(openRange, parentToNested));\n      openRange = undefined;\n    }\n\n    if (openRange === undefined) {\n      let openRangeEnd: number = event.offset + 1;\n      for (const {parentIndex, tree} of event.trees) {\n        openRangeEnd = Math.max(openRangeEnd, tree.end);\n        insertChild(parentToNested, parentIndex, tree);\n      }\n      startEventQueue.setPendingOffset(openRangeEnd);\n      openRange = {start: event.offset, end: openRangeEnd};\n    } else {\n      for (const {parentIndex, tree} of event.trees) {\n        if (tree.end > openRange.end) {\n          const right: RangeTree = tree.split(openRange.end);\n          startEventQueue.pushPendingTree(new RangeTreeWithParent(parentIndex, right));\n        }\n        insertChild(parentToNested, parentIndex, tree);\n      }\n    }\n  }\n  if (openRange !== undefined) {\n    result.push(nextChild(openRange, parentToNested));\n  }\n\n  return result;\n}\n\nfunction insertChild(parentToNested: Map<number, RangeTree[]>, parentIndex: number, tree: RangeTree): void {\n  let nested: RangeTree[] | undefined = parentToNested.get(parentIndex);\n  if (nested === undefined) {\n    nested = [];\n    parentToNested.set(parentIndex, nested);\n  }\n  nested.push(tree);\n}\n\nfunction nextChild(openRange: Range, parentToNested: Map<number, RangeTree[]>): RangeTree {\n  const matchingTrees: RangeTree[] = [];\n\n  for (const nested of parentToNested.values()) {\n    if (nested.length === 1 && nested[0].start === openRange.start && nested[0].end === openRange.end) {\n      matchingTrees.push(nested[0]);\n    } else {\n      matchingTrees.push(new RangeTree(\n        openRange.start,\n        openRange.end,\n        0,\n        nested,\n      ));\n    }\n  }\n  parentToNested.clear();\n  return mergeRangeTrees(matchingTrees)!;\n}\n"],"sourceRoot":""}
